<template>
  <div class="table">
    <div class="crumbs">
      <i class="el-icon-tickets"></i>歌曲信息
    </div>
    <div class="container">
      <div class="handle-box">
        <el-button type="primary" size="mini" @click="delAll">批量删除</el-button>
        <el-input v-model="select_word" size="mini" placeholder="请输入歌曲名" class="handle-input"></el-input>
        <el-button type="primary" size="mini" @click="centerDialogVisible = true">添加歌曲</el-button>
      </div>
    </div>
    <el-table size="mini" ref="multipleTable" border style="width:100%" height="680px" :data="data" @selection-change="handleSelectionChange">
      <el-table-column type="selection" width="40"></el-table-column>
      <el-table-column label="歌曲图片" width="110" align="center">
        <template slot-scope="scope">
          <div class="song-img">
            <img :src="getUrl(scope.row.pic)" style="width:100%"/>
          </div>
          <div class="play" @click="setSongUrl(scope.row.url,scope.row.name)">
            <div v-if="toggle == scope.row.name">
              <svg class="icon">
                <use xlink:href="#icon-zanting"></use>
              </svg>
            </div>
            <div v-if="toggle != scope.row.name">
              <svg class="icon">
                <use xlink:href="#icon-bofanganniu"></use>
              </svg>
            </div>
          </div>
        </template>
      </el-table-column>
      <el-table-column prop="name" label="歌手-歌名" width="120" align="center"></el-table-column>
      <el-table-column prop="introduction" label="专辑" width="150" align="center"></el-table-column>
      <el-table-column label="歌词" align="center">
        <template slot-scope="scope">
          <ul style="height:100px;overflow:scroll;">
            <li v-for="(item,index) in parseLyric(scope.row.lyric)" :key="index">
              {{item}}
            </li>
          </ul>
        </template>
      </el-table-column>
      <el-table-column label="资源更新" align="center" width="100">
        <template slot-scope="scope">
          <el-upload :action="uploadUrl(scope.row.id)" :before-upload="beforeAvatorUpload"
                     :on-success="handleAvatorSuccess">
            <el-button size="mini">更新图片</el-button>
          </el-upload>
          <br/>
          <el-upload :action="uploadSongUrl(scope.row.id)" :before-upload="beforeSongUpload"
                     :on-success="handleSongSuccess">
            <el-button size="mini">更新歌曲</el-button>
          </el-upload>
        </template>
      </el-table-column>

      <el-table-column label="操作" width="150" align="center">
        <template slot-scope="scope">
          <el-button size="mini" @click="handleEdit(scope.row)">编辑</el-button>
          <el-button size="mini" type="danger" @click="handleDelete(scope.row.id)">删除</el-button>
        </template>
      </el-table-column>
    </el-table>
    <div class="pagination">
      <el-pagination
        background
        layout = "total,prev,pager,next"
        :current-page="currentPage"
        :page-size="pageSize"
        :total="tableData.length"
        @current-change="handleCurrentChange"
      >
      </el-pagination>
    </div>

    <el-dialog title="添加歌曲" :visible.sync="centerDialogVisible" width="400px" center>
      <el-form :model="registerForm" ref="registerForm" label-width="80px" action="" id="tf">
        <div>
          <label>歌名</label>
          <el-input type="text" name="name"></el-input>
        </div>
        <div>
          <label>专辑</label>
          <el-input type="text" name="introduction"></el-input>
        </div>
        <div>
          <label>歌词</label>
          <el-input type="textarea" name="lyric"></el-input>
        </div>
        <div>
          <label>歌曲上传</label>
          <input type="file" name="file">
        </div>
      </el-form>
      <span slot="footer">
                <el-button size="mini" @click="centerDialogVisible = false">取消</el-button>
                <el-button size="mini" @click="addSong">确定</el-button>
            </span>
    </el-dialog>

    <el-dialog title="修改歌曲" :visible.sync="editVisible" width="400px" center>
      <el-form :model="form" ref="form" label-width="80px">
        <el-form-item prop="name" label="歌手-歌名" size="mini">
          <el-input v-model="form.name" placeholder="歌手-歌名"></el-input>
        </el-form-item>
        <el-form-item prop="introduction" label="专辑" size="mini">
          <el-input v-model="form.introduction" placeholder="专辑"></el-input>
        </el-form-item>
        <el-form-item prop="lyric" label="歌词" size="mini">
          <el-input v-model="form.lyric" placeholder="歌词" type="textarea"></el-input>
        </el-form-item>

      </el-form>
      <span slot="footer">
                <el-button size="mini" @click="editVisible = false">取消</el-button>
                <el-button size="mini" @click="editSave">确定</el-button>
            </span>
    </el-dialog>

    <el-dialog title="删除歌曲" :visible.sync="delVisible" width="300px" center>
      <div align="center">删除不可恢复，是否确定删除？</div>
      <span slot="footer">
                <el-button size="mini" @click="delVisible = false">取消</el-button>
                <el-button size="mini" @click="deleteRow">确定</el-button>
            </span>
    </el-dialog>
  </div>
</template>

<script>
  import { mixin } from '../mixins/index';
  import {mapGetters} from 'vuex';
  import '@/assets/js/iconfont.js';
  import {songOfSingerId,updateSong,delSong} from '../api/index';

  export default {
    mixins: [mixin],
    data(){
      return{
        singerId: '',               //歌手id
        singerName: '',             //歌手名
        centerDialogVisible: false, //添加弹窗是否显示
        editVisible: false,         //编辑弹窗是否显示
        delVisible: false,          //删除弹窗是否显示
        registerForm:{      //添加框
          name: '',
          singerName: '',
          introduction: '',
          lyric: ''
        },
        form:{      //编辑框
          id: '',
          name: '',
          introduction: '',
          lyric: ''
        },
        tableData: [],
        tempData: [],
        select_word: '',
        pageSize: 5,    //分页每页大小
        currentPage: 1,  //当前页
        idx: -1,          //当前选择项
        multipleSelection: [],   //哪些项已经打勾
        toggle: false           //播放器的图标状态
      }
    },
    computed:{
      ...mapGetters([
        'isPlay'
      ]),
      //计算当前搜索结果表里的数据
      data(){
        return this.tableData.slice((this.currentPage - 1) * this.pageSize,this.currentPage * this.pageSize)
      }
    },
    watch:{
      //搜索框里面的内容发生变化的时候，搜索结果table列表的内容跟着它的内容发生变化
      select_word: function(){
        if(this.select_word == ''){
          this.tableData = this.tempData;
        }else{
          this.tableData = [];
          for(let item of this.tempData){
            if(item.name.includes(this.select_word)){
              this.tableData.push(item);
            }
          }
        }
      }
    },
    created(){
      this.singerId = this.$route.query.id;
      this.singerName = this.$route.query.name;
      this.getData();
    },
    destroyed() {
      this.$store.commit('setIsPlay',false);
    },
    methods:{
      //获取当前页
      handleCurrentChange(val){
        this.currentPage = val;
      },
      //查询所有歌手
      getData(){
        this.tempData = [];
        this.tableData = [];
        songOfSingerId(this.singerId).then(res => {
          this.tempData = res;
          this.tableData = res;
          this.currentPage = 1;
        })
      },
      //添加歌手
      addSong(){
        let _this = this;
        var form = new FormData(document.getElementById('tf'));
        form.append('singerId',this.singerId);
        form.set('name',this.singerName+'-'+form.get('name'));
        if(!form.get('lyric')){
          form.set('lyric','[00:00:00]暂无歌词');
        }
        var req = new XMLHttpRequest();
        req.onreadystatechange = function(){
          //req.readyState == 4 获取到返回的完整数据
          //req.status == 200 和后台正常交互完成
          if(req.readyState == 4 && req.status == 200){
            let res = JSON.parse(req.response);
            if(res.code){
              _this.getData();
              _this.registerForm = {};
              _this.notify(res.msg,'success');
            }else{
              _this.notify('保存失败','error');
            }
          }
        }
        req.open('post',`${_this.$store.state.HOST}/song/add`,false);
        req.send(form);
        _this.centerDialogVisible = false;
      },
      //弹出编辑页面
      handleEdit(row){
        this.editVisible = true;
        this.form = {
          id: row.id,
          name: row.name,
          introduction: row.introduction,
          lyric: row.lyric
        }
      },
      //保存编辑页面修改的数据
      editSave(){
        let params = new URLSearchParams();
        params.append('id',this.form.id);
        params.append('name',this.form.name);
        params.append('introduction',this.form.introduction);
        params.append('lyric',this.form.lyric);

        updateSong(params)
          .then(res => {
            if(res.code == 1){
              this.getData();
              this.notify("修改成功","success");
            }else{
              this.notify("修改失败","error");
            }
          })
          .catch(err => {
            console.log(err);
          });
        this.editVisible = false;
      },
      //更新图片
      uploadUrl(id){
        return `${this.$store.state.HOST}/song/updateSongPic?id=${id}`
      },
      //删除一名歌手
      deleteRow(){
        delSong(this.idx)
          .then(res => {
            if(res){
              this.getData();
              this.notify("删除成功","success");
            }else{
              this.notify("删除失败","error");
            }
          })
          .catch(err => {
            console.log(err);
          });
        this.delVisible = false;
      },
      //解析歌词
      parseLyric(text){
        let lines = text.split("\n");
        let pattern = /\[\d{2}:\d{2}.(\d{3}|\d{2})\]/g;
        let result = [];
        for(let item of lines){
          let value = item.replace(pattern,'');
          result.push(value);
        }
        return result;
      },
      //上传歌曲之前的校验
      beforeSongUpload(file){
        var testMsg = file.name.substring(file.name.lastIndexOf('.') + 1);
        if(testMsg!='mp3'){
          this.$message({
            message: '上传文件只能是mp3格式',
            type: 'error'
          });
          return false;
        }
        return true;
      },
      //上传歌曲成功之后要做的工作
      handleSongSuccess(res){
        let _this = this;
        if(res.code == 1){
          _this.getData();
          _this.$notify({
            title: '上传成功',
            type: 'success'
          });
        }else{
          _this.$notify({
            title: '上传失败',
            type: 'error'
          });
        }
      },
      //更新歌曲url
      uploadSongUrl(id){
        return `${this.$store.state.HOST}/song/updateSongUrl?id=${id}`
      },
      //切换播放歌曲
      setSongUrl(url,name) {
        this.toggle = name;
        this.$store.commit('setUrl',this.$store.state.HOST + url);
        if(this.isPlay){
          this.$store.commit('setIsPlay',false);
        }else{
          this.$store.commit('setIsPlay',true);
        }
      }
    }
  }
</script>

<style scoped>
  .handle-box{
    margin-bottom: 20px;
  }
  .song-img{
    width: 100%;
    height: 80px;
    border-radius: 5px;
    margin-bottom: 5px;
    overflow: hidden;
  }
  .handle-input{
    width: 300px;
    display: inline-block;
  }
  .pagination{
    display: flex;
    justify-content: center;
  }
  .play {
    position: absolute;
    z-index: 100;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    top: 18px;
    left: 15px;
  }

  .icon {
    width: 2em;
    height: 2em;
    color: white;
    fill: currentColor;
    overflow: hidden;
  }
</style>
